A member of the team explained that they have a game called Creative Playground (beta testing is open now) where 90% of it is written in Rust, where they still rely on physx and MoltenVK in C++.

So it seems like their other games then are more like 10% rust and 90% c++.

But I’m assuming that the Creative Playground is like a testing ground for using Rust in larger capacities down the road then